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Gomes STM, da Silva Graça Amoras E, Gomes ÉR, Queiroz MAF, Júnior ECS, de Vasconcelos Massafra JM, da Silva Lemos P, Júnior JLV, Ishak R, Vallinoto ACR. Immune escape mutations in HIV-1 controllers in the Brazilian Amazon region. BMC Infect Dis 2020; 20:546. [PMID: 32711474 PMCID: PMC7382849 DOI: 10.1186/s12879-020-05268-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 07/16/2020] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Human immunodeficiency virus (HIV-1) infection is characterized by high viral replication and a decrease in CD4+ T cells (CD4+TC), resulting in AIDS, which can lead to death. In elite controllers and viremia controllers, viral replication is naturally controlled, with maintenance of CD4+TC levels without the use of antiretroviral therapy (ART). METHODS The aim of the present study was to describe virological and immunological risk factors among HIV-1-infected individuals according to characteristics of progression to AIDS. The sample included 30 treatment-naive patients classified into three groups based on infection duration (> 6 years), CD4+TC count and viral load: (i) 2 elite controllers (ECs), (ii) 7 viremia controllers (VCs) and (iii) 21 nonviremia controllers (NVCs). Nested PCR was employed to amplify the virus genome, which was later sequenced using the Ion PGM platform for subtyping and analysis of immune escape mutations. RESULTS Viral samples were classified as HIV-1 subtypes B and F. Greater selection pressure on mutations was observed in the group of viremia controllers, with a higher frequency of immunological escape mutations in the genes investigated, including two new mutations in gag. The viral sequences of viremia controllers and nonviremia controllers did not differ significantly regarding the presence of immune escape mutations. CONCLUSION The results suggest that progression to AIDS is not dependent on a single variable but rather on a set of characteristics and pressures exerted by virus biology and interactions with immunogenetic host factors.
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Affiliation(s)
- Samara Tatielle Monteiro Gomes
- Laboratory of Virology, Biological Science Institute, Federal University of Pará (ICB/UFPA), Ananindeua, Brazil
- Graduate Program in Biology of Infectious and Parasitic Agents, Biological Science Institute, Federal University of Pará, Ananindeua, Brazil
| | | | - Érica Ribeiro Gomes
- Laboratory of Virology, Biological Science Institute, Federal University of Pará (ICB/UFPA), Ananindeua, Brazil
| | - Maria Alice Freitas Queiroz
- Laboratory of Virology, Biological Science Institute, Federal University of Pará (ICB/UFPA), Ananindeua, Brazil
| | - Edivaldo Costa Sousa Júnior
- Health Surveillance Department, Ministry of Health (IEC-SVS/MS), Evandro Chagas Institute, Ananindeua, Brazil
| | | | - Poliana da Silva Lemos
- Health Surveillance Department, Ministry of Health (IEC-SVS/MS), Evandro Chagas Institute, Ananindeua, Brazil
| | - João Lídio Vianez Júnior
- Health Surveillance Department, Ministry of Health (IEC-SVS/MS), Evandro Chagas Institute, Ananindeua, Brazil
| | - Ricardo Ishak
- Laboratory of Virology, Biological Science Institute, Federal University of Pará (ICB/UFPA), Ananindeua, Brazil
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Tauro LB, de Souza WM, Rivarola ME, de Oliveira R, Konigheim B, Silva SP, Lima C, Oliveira L, Vasconcelos JM, Cardoso JF, Júnior JLV, Nunes MRT, Contigiani MS. Genomic characterization of orthobunyavirus of veterinary importance in America. Infect Genet Evol 2019; 73:205-209. [PMID: 31048078 DOI: 10.1016/j.meegid.2019.04.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 04/12/2019] [Accepted: 04/27/2019] [Indexed: 10/26/2022]
Abstract
During 2013, in Argentina, three new isolates of serogroup Bunyamwera virus (genus Orthobunyavirus, family Peribunyaviridae) were recovered from two horses with encephalitis, and from an aborted equine fetus. In the present study, we report the complete genome sequence, genetic characterization, and phylogenetic analysis of three new strains isolated in Argentina to clarifying their relationship within the Bunyamwera serogroup virus and to investigate the evolutionary history of viruses with segmented genomes.
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Affiliation(s)
- Laura B Tauro
- Instituto de Virologia "Dr J. M. Vanella", Facultad de Ciencias Medicas, Universidad Nacional, Ciudad Universitária, X5016 GRA Córdoba, Argentina.
| | - William Marciel de Souza
- Virology Research Center, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900, 14049-900 Ribeirão Preto, São Paulo, Brazil
| | - Maria Elisa Rivarola
- Instituto de Virologia "Dr J. M. Vanella", Facultad de Ciencias Medicas, Universidad Nacional, Ciudad Universitária, X5016 GRA Córdoba, Argentina
| | - Rodrigo de Oliveira
- Instituto Evandro Chagas, Rodovia BR-316 KM 7 S/N, 67030-000 Ananindeua, Pará, Brazil
| | - Brenda Konigheim
- Instituto de Virologia "Dr J. M. Vanella", Facultad de Ciencias Medicas, Universidad Nacional, Ciudad Universitária, X5016 GRA Córdoba, Argentina
| | - Sandro Patroca Silva
- Instituto Evandro Chagas, Rodovia BR-316 KM 7 S/N, 67030-000 Ananindeua, Pará, Brazil
| | - Clayton Lima
- Instituto Evandro Chagas, Rodovia BR-316 KM 7 S/N, 67030-000 Ananindeua, Pará, Brazil
| | - Layanna Oliveira
- Instituto Evandro Chagas, Rodovia BR-316 KM 7 S/N, 67030-000 Ananindeua, Pará, Brazil
| | - Janaina M Vasconcelos
- Instituto Evandro Chagas, Rodovia BR-316 KM 7 S/N, 67030-000 Ananindeua, Pará, Brazil
| | | | | | | | - Marta S Contigiani
- Instituto de Virologia "Dr J. M. Vanella", Facultad de Ciencias Medicas, Universidad Nacional, Ciudad Universitária, X5016 GRA Córdoba, Argentina
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